remove btrfs and overlay from "safe" storage drivers

diff --git a/launcher b/launcher
index b629bfc1056ac1423ecce4ba07fe97fdd29b96ed..ef73c5f5e767b7dc5d4dc9406ee24afcd4a4065a 100755 (executable)
--- a/launcher
+++ b/launcher
@@ -153,7 +153,7 @@ check_prereqs() {
   fi
 
   # 2. running an approved storage driver?
-  if ! $docker_path info 2> /dev/null | egrep -q '^Storage Driver: (aufs|btrfs|zfs|overlay|overlay2)$'; then
+  if ! $docker_path info 2> /dev/null | egrep -q '^Storage Driver: (aufs|zfs|overlay2)$'; then
     echo "Your Docker installation is not using a supported storage driver.  If we were to proceed you may have a broken install."
     echo "aufs is the recommended storage driver, although zfs/btrfs/overlay and overlay2 may work as well."
     echo "Other storage drivers are known to be problematic."